M.-P.-VOL. I.] CRAW FORD- CONSTANT OF REFRACTION. 167 



The following tables contain the reductions for dlogr or 

 its equivalent dloga. The second column contains the 

 logarithms of the computed refractions; the next column 

 contains the logarithms of the observed refractions; the 

 fourth the difference between the two preceding, in the 

 sense of Observed Computed; the column^ contains the 

 weights and the last column the weighted differences. 

 The residuals and their weighted squares are not given. 

 Log \_-pw~\ is given in every case, as is also the resulting 

 probable error of the weighted mean of every set. All of 

 the results in the following tables have been checked. 



STAR No. 948. 



I 0.00205 



[p] = 50^ ; logpw\ = 5-8653 



p. e. = 0.00015 



